Borrowings and Other Financing Instruments Long-Term Borrowings and Other Financing Instruments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross		$ 28,419	$ 25,465
2025		1,103
2026		501
2027		501
2028		1,133
2029		$ 503
NSP Minnesota
Long-Term Borrowings and Other Financing Instruments
Debt Instrument, Interest Rate, Stated Percentage		2.60%
Debt Instrument, Repurchased Face Amount		$ 166
Debt Instrument, Repurchase Amount		105
Gain (Loss) on Repurchase of Debt Instrument		56
Xcel Energy Inc.
Long-Term Borrowings and Other Financing Instruments
Unamortized discount		(9)	(8)
Unamortized Debt Issuance Expense		(34)	(36)
Current Maturities		(600)	0
Long-term Debt		6,337	6,136
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2025 2 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2026 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		3.35%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due March 15, 2027
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		1.75%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (130)	(130)
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 15, 2028 2 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2029 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		2.60%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2030
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (600)	(600)
Debt Instrument, Interest Rate, Stated Percentage		3.40%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Nov. 15, 2031
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		2.35%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due July 1, 2036 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		6.50%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Sept. 15, 2041 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		4.80%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Dec. 1, 2049 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		3.50%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due June 1, 2032
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (700)	(700)
Debt Instrument, Interest Rate, Stated Percentage		4.60%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Aug. 15, 2033
Long-Term Borrowings and Other Financing Instruments
Face Amount	[1]	$ (800)	(800)
Debt Instrument, Interest Rate, Stated Percentage	[1]	5.45%
Xcel Energy Inc. | Unsecured Debt [Member] | Series Due Mar. 15, 2034
Long-Term Borrowings and Other Financing Instruments
Face Amount	[2]	$ (800)	0
Debt Instrument, Interest Rate, Stated Percentage	[2]	5.50%
NSP Minnesota
Long-Term Borrowings and Other Financing Instruments
Unamortized discount		$ (49)	(49)
Unamortized Debt Issuance Expense		(80)	(73)
Current Maturities		(250)	0
Long-term Debt		7,607	7,330
NSP Minnesota | Mortgage bonds | Series Due July 1, 2025 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		7.125%
NSP Minnesota | Mortgage bonds | Series Due March 1, 2028 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (150)	(150)
Debt Instrument, Interest Rate, Stated Percentage		6.50%
NSP Minnesota | Mortgage bonds | Series Due April 1, 2031
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (425)	(425)
Debt Instrument, Interest Rate, Stated Percentage		2.25%
NSP Minnesota | Mortgage bonds | Series Due July 15, 2035 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		5.25%
NSP Minnesota | Mortgage bonds | Series Due June 1, 2036 [Domain]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (400)	(400)
Debt Instrument, Interest Rate, Stated Percentage		6.25%
NSP Minnesota | Mortgage bonds | Series Due July 1, 2037 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		6.20%
NSP Minnesota | Mortgage bonds | Series Due Nov. 1, 2039 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		5.35%
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2040 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		4.85%
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2042 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		3.40%
NSP Minnesota | Mortgage bonds | Series Due May 15, 2044 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		4.125%
NSP Minnesota | Mortgage bonds | Series Due Aug. 15, 2045 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		4.00%
NSP Minnesota | Mortgage bonds | Series Due May 15, 2046 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		3.60%
NSP Minnesota | Mortgage bonds | Series Due Sept. 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (600)	(600)
Debt Instrument, Interest Rate, Stated Percentage		3.60%
NSP Minnesota | Mortgage bonds | Series Due March 1, 2050
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (600)	(600)
Debt Instrument, Interest Rate, Stated Percentage		2.90%
NSP Minnesota | Mortgage bonds | Series Due June 1, 2051
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (700)	(700)
Debt Instrument, Interest Rate, Stated Percentage		2.60%
NSP Minnesota | Mortgage bonds | Series Due June 1, 2051 | Xcel Energy [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (166)	0
Debt Instrument, Interest Rate, Stated Percentage		2.60%
NSP Minnesota | Mortgage bonds | Series Due April 1, 2052
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (425)	(425)
Debt Instrument, Interest Rate, Stated Percentage		3.20%
NSP Minnesota | Mortgage bonds | Series Due June 1, 2052
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		4.50%
NSP Minnesota | Mortgage bonds | Series Due May 15, 2053
Long-Term Borrowings and Other Financing Instruments
Face Amount	[3]	$ (800)	(800)
Debt Instrument, Interest Rate, Stated Percentage	[3]	5.10%
NSP Minnesota | Mortgage bonds | Series Due Mar. 15, 2054
Long-Term Borrowings and Other Financing Instruments
Face Amount	[4]	$ (700)	0
Debt Instrument, Interest Rate, Stated Percentage	[4]	5.40%
NSP Minnesota | Long-term Debt
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (2)	(2)
NSP-Wisconsin
Long-Term Borrowings and Other Financing Instruments
Unamortized discount		(4)	(3)
Unamortized Debt Issuance Expense		(15)	(11)
Current Maturities		0	(200)
Long-term Debt		1,406	1,011
NSP-Wisconsin | Mortgage bonds | Series Due Sept. 1, 2038 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (200)	(200)
Debt Instrument, Interest Rate, Stated Percentage		6.375%
NSP-Wisconsin | Mortgage bonds | Series Due Oct. 1, 2042 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		3.70%
NSP-Wisconsin | Mortgage bonds | Series Due Dec. 1, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		3.75%
NSP-Wisconsin | Mortgage bonds | Series Due September 1, 2048 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (200)	(200)
Debt Instrument, Interest Rate, Stated Percentage		4.20%
NSP-Wisconsin | Mortgage bonds | Series Due May 1, 2051
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		3.05%
NSP-Wisconsin | Mortgage bonds | Series Due May 1, 2051 2
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		2.82%
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 0	(100)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2024 2 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 0	(100)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
NSP-Wisconsin | Mortgage bonds | Series Due Sept. 15, 2052
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		4.86%
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2053
Long-Term Borrowings and Other Financing Instruments
Face Amount	[5]	$ (125)	(125)
Debt Instrument, Interest Rate, Stated Percentage	[5]	5.30%
NSP-Wisconsin | Mortgage bonds | Series Due June 15, 2054
Long-Term Borrowings and Other Financing Instruments
Face Amount	[6]	$ (400)	0
Debt Instrument, Interest Rate, Stated Percentage	[6]	5.65%
PSCo
Long-Term Borrowings and Other Financing Instruments
Unamortized discount		$ (42)	(41)
Unamortized Debt Issuance Expense		(67)	(59)
Current Maturities		(250)	0
Long-term Debt		8,391	7,450
PSCo | Mortgage bonds | Series Due June 15, 2028
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		3.70%
PSCo | Mortgage bonds | Series Due March 1, 2050
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (550)	(550)
Debt Instrument, Interest Rate, Stated Percentage		3.20%
PSCo | Mortgage bonds | Series Due May 15, 2025 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		2.90%
PSCo | Mortgage bonds | Series Due Jan. 15, 2031
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (375)	(375)
Debt Instrument, Interest Rate, Stated Percentage		1.90%
PSCo | Mortgage bonds | Series Due June 15, 2031
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (750)	(750)
Debt Instrument, Interest Rate, Stated Percentage		1.875%
PSCo | Mortgage bonds | Series Due Sept. 1, 2037 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		6.25%
PSCo | Mortgage bonds | Series Due Aug. 1, 2038 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		6.50%
PSCo | Mortgage bonds | Series Due Aug. 15, 2041 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		4.75%
PSCo | Mortgage bonds | Series Due Sept. 15, 2042 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (500)	(500)
Debt Instrument, Interest Rate, Stated Percentage		3.60%
PSCo | Mortgage bonds | Series Due March 15, 2043 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		3.95%
PSCo | Mortgage bonds | Series Due March 15, 2044 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		4.30%
PSCo | Mortgage bonds | Series Due June 15, 2046 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		3.55%
PSCo | Mortgage bonds | Series Due June 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (400)	(400)
Debt Instrument, Interest Rate, Stated Percentage		3.80%
PSCo | Mortgage bonds | Series Due June 15, 2048
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		4.10%
PSCo | Mortgage bonds | Series Due September 15, 2049
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (400)	(400)
Debt Instrument, Interest Rate, Stated Percentage		4.05%
PSCo | Mortgage bonds | Series Due Jan. 15, 2051
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (375)	(375)
Debt Instrument, Interest Rate, Stated Percentage		2.70%
PSCo | Mortgage bonds | Series Due June 1, 2052
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (400)	(400)
Debt Instrument, Interest Rate, Stated Percentage		4.50%
PSCo | Mortgage bonds | Series Due June 1, 2032 2
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		4.10%
PSCo | Mortgage bonds | Series Due April 1, 2053
Long-Term Borrowings and Other Financing Instruments
Face Amount	[7]	$ (850)	(850)
Debt Instrument, Interest Rate, Stated Percentage	[7]	5.25%
PSCo | Mortgage bonds | Series Due May 15, 2034
Long-Term Borrowings and Other Financing Instruments
Face Amount	[8]	$ (450)	0
Debt Instrument, Interest Rate, Stated Percentage	[8]	5.35%
PSCo | Mortgage bonds | Series Due May 15, 2054
Long-Term Borrowings and Other Financing Instruments
Face Amount	[8]	$ (750)	0
Debt Instrument, Interest Rate, Stated Percentage	[8]	5.75%
SPS
Long-Term Borrowings and Other Financing Instruments
Unamortized discount		$ (14)	(10)
Unamortized Debt Issuance Expense		(35)	(29)
Current Maturities		0	(350)
Long-term Debt		3,551	2,961
SPS | Mortgage bonds | Series Due June 15, 2024 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 0	(150)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
SPS | Mortgage bonds | Series Due June 15, 2024 2 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ 0	(200)
Debt Instrument, Interest Rate, Stated Percentage		3.30%
SPS | Mortgage bonds | Series Due Aug. 15, 2041 4
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (200)	(200)
Debt Instrument, Interest Rate, Stated Percentage		4.50%
SPS | Mortgage bonds | Series Due Aug. 15, 2041 2 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		4.50%
SPS | Mortgage bonds | Series Due Aug. 15, 2041 3 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		4.50%
SPS | Mortgage bonds | Series Due August 15, 2046 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		3.40%
SPS | Mortgage bonds | Series Due August 15, 2047
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (450)	(450)
Debt Instrument, Interest Rate, Stated Percentage		3.70%
SPS | Mortgage bonds | Series Due Nov. 15, 2048 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		4.40%
SPS | Mortgage bonds | Series Due June 15, 2049
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (300)	(300)
Debt Instrument, Interest Rate, Stated Percentage		3.75%
SPS | Mortgage bonds | Series due May 1, 2050
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (350)	(350)
Debt Instrument, Interest Rate, Stated Percentage		3.15%
SPS | Mortgage bonds | Series due May 1, 2050 2
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		3.15%
SPS | Mortgage bonds | Series Due June 1, 2052
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (200)	(200)
Debt Instrument, Interest Rate, Stated Percentage		5.15%
SPS | Mortgage bonds | Series Due Sept. 15, 2053
Long-Term Borrowings and Other Financing Instruments
Face Amount	[9]	$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage	[9]	6.00%
SPS | Mortgage bonds | Series Due June 15, 2054
Long-Term Borrowings and Other Financing Instruments
Face Amount	[10]	$ (600)	0
Debt Instrument, Interest Rate, Stated Percentage	[10]	6.00%
SPS | Unsecured Debt [Member] | Senior C and D Due Oct. 1, 2033 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (100)	(100)
Debt Instrument, Interest Rate, Stated Percentage		6.00%
SPS | Unsecured Debt [Member] | Senior F Due Oct. 1, 2036 [Member]
Long-Term Borrowings and Other Financing Instruments
Face Amount		$ (250)	(250)
Debt Instrument, Interest Rate, Stated Percentage		6.00%
Other Subsidiaries
Long-Term Borrowings and Other Financing Instruments
Current Maturities		$ (3)	(2)
Long-term Debt		24	25
Other Subsidiaries | Various Eloigne Co. affordable housing project notes
Long-Term Borrowings and Other Financing Instruments
Long-term Debt, Gross		$ 27	$ 27

[1] 2023 financing

[2] 2024 financing

[3] 2023 financing.

[4] 2024 financing.

[5] 2023 financing.

[6] 2024 financing.

[7] 2023 financing.

[8] 2024 financing

[9] 2023 financing.

[10] 2024 financing